Distance detection method and device

Abstract

The application discloses a distance detection method and device. The device includes a magnetic antenna used for radiating electromagnetic waves; an oscillation circuit which is connected with the magnetic antenna and used for generating sine AC electrical signals and inputting the sine AC electrical signals to the magnetic antenna; a current detection circuit which is connected with the magnetic antenna and used for detecting the value of a current on the magnetic antenna; a signal processing circuit which is connected with the oscillation circuit and the current detection circuit and used for obtaining apparent powers by multiplying a voltage value of the sine AC electrical signals and a current value output by the current detection circuit and carrying out low-pass filtering on the apparent powers so as to obtain an active power in the apparent powers; and a processor which is connected with the signal processing circuit and used for referring to a corresponding relation of a preset power and a distance to calculate the distance between the distance detection device and a target conductor. The distance detection method and device are capable of improving the accuracy of distance measurement.

Description

technical field [0001] The present application relates to the technical field of distance measurement, in particular to a distance detection method and device. Background technique [0002] Commonly used methods for distance measurement include ruler measurement, line-of-sight measurement, parallax distance measurement and laser distance measurement. The more common laser distance measurement uses laser emitting components (such as laser diodes) to emit laser beams to detect objects. The laser rangefinder is an instrument that uses laser to measure the distance between the device and the target object (a conductor). When the laser range finder is working, it emits a very thin beam of laser light to the target object, and the photoelectric element receives the laser beam reflected by the target object. distance between. [0003] However, the inventor has found through research and experiments that the accuracy of laser ranging mainly depends on the measurement accuracy of t...

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Problems solved by technology

[0003] However, the inventor has found through research and experiments that the accuracy of laser ranging mainly depends on the measurement accuracy of the round-trip time. When the distance between the laser emitting device and the target is small, there will be a large error in the measurement result of the time. And then affect the accuracy of the ranging results

In addition, the measurement accuracy of laser ranging is also easily interfered by external factors. For example, when performing laser ranging, the reflective surface of the target must be perpendicular to the beam, otherwise the return signal is too weak and the accurate distance cannot be obtained. In addition, the target's The degree of diffuse reflection of the reflective surface and the degree of interference of background light will affect the accuracy of laser ranging

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